function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chatterjee, Tapas & Dovgal, Igor', 1],
    ['Chatterjee, Tapas & Dovgal, Igor & Fernandez-Leborans, Gregorio', 4],
    ['Chatterjee, Tapas & Dovgal, Igor & Mayén-Estrada, Rosaura', 1],
    ['Drobiniak, O. & Kutsokon, Yu. & Kvach, Yu.', 6],
    ['Göçmen, Bayram', 4],
    ['Tang, Fahui & Zhang, Yong & Zhao, Yuanjun', 1],
    ['Tang, Fahui & Zhao, Yuanjun & Tao, Yanfei', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);